package com.qingcloud.adminbackend;

import com.qingcloud.df.sdk.exchange.annotation.FieldOptions;
import com.qingcloud.df.sdk.exchange.annotation.ProtocolField;
import com.qingcloud.df.sdk.exchange.protocol.bytes.BaseBytesProtocol;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.buffer.Unpooled;

public class proto extends BaseBytesProtocol {


    @ProtocolField(index = 1, desc = "起始字节公共字节", fixed = true)
    private byte header = 0x7E;

    @ProtocolField(index = 2, desc = "消息标识", fixed = true)
    private byte flag = (byte) 0xAA;

    @ProtocolField(index = 3, desc = "消息体长度", calculate = true)
    private short bodyLength;

    @ProtocolField(index = 4, desc = "命令序列号", inputOption = @FieldOptions(title = "命令序列号", tips = "命令的序列号，不要下发相同序号的指令"))
    private short number;

    @ProtocolField(index = 5, desc = "命令标识1", fixed = true)
    private byte catagoryCode = 0x0B;

    @ProtocolField(index = 6, desc = "命令标识2", fixed = true)
    private byte catagoryCode1 = 0x01;

    @ProtocolField(index = 7, desc = "消息内容长度", fixed = true)
    private byte commandLength = (byte) 0;

    @ProtocolField(index = 8, desc = "CRC", calculate = true)
    private byte[] crcbyte;

    @Override
    public String getSerialNumber() {
        return null;
    }

    @Override
    public void calculate() {
        //计算消息体长度
        this.bodyLength = 2 + 1 + 1 + 1;
        //计算crc
        ByteBuf buffer = Unpooled.buffer(this.bodyLength);
        buffer = buffer.writeShort(number);
        buffer = buffer.writeByte(this.catagoryCode);
        buffer = buffer.writeByte(this.catagoryCode1);
        buffer = buffer.writeByte(this.commandLength);
        ByteBuf crcBuffer = Unpooled.buffer(2);
        short crc = calCrc(ByteBufUtil.getBytes(buffer), 0, 5);
        this.crcbyte = ByteBufUtil.getBytes(crcBuffer.writeShort(crc));
    }

    final static int[] CRC_TABLE = new int[]{ /* CRC余式表 */
            0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241, 0xC601,
            0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440, 0xCC01,
            0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40, 0x0A00,
            0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841, 0xD801,
            0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40, 0x1E00,
            0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41, 0x1400,
            0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641, 0xD201,
            0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040, 0xF001,
            0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240, 0x3600,
            0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441, 0x3C00,
            0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41, 0xFA01,
            0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840, 0x2800,
            0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41, 0xEE01,
            0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40, 0xE401,
            0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640, 0x2200,
            0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041, 0xA001,
            0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240, 0x6600,
            0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441, 0x6C00,
            0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41, 0xAA01,
            0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840, 0x7800,
            0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41, 0xBE01,
            0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40, 0xB401,
            0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640, 0x7200,
            0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041, 0x5000,
            0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241, 0x9601,
            0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440, 0x9C01,
            0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40, 0x5A00,
            0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841, 0x8801,
            0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40, 0x4E00,
            0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41, 0x4400,
            0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641, 0x8201,
            0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040,};


    public static short calCrc(byte[] buff, int start, int length) {
        int crc = 0xffff;
        for (int i = 0; i < length; i++) {
            crc = (crc >>> 8) ^ CRC_TABLE[(crc ^ buff[start + i]) & 0xff];
        }
        return (short) crc;
    }
}
